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Chapter 9. OpenGL > Creating a Color Scale
Creating a Color Scale
It is useful to show the representation of colors assigned to the data plot on the GUI. For this the Map Color control is created to act as a legend for the colors showing the data range. The CreateColorScale function is called from the PlotOGLData function above for this purpose. The source listing for CreateColorScale is shown in Figure 9-9.
Figure 9-9. CreateColorScale Source Listing
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Code View:
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Show All //Display color map on the Color Map scale
int CreateColorScale (void)
{
double ColorMapArray[5][2];
int NumberOfXpoints, NumberOfYpoints, NumberOfColors,
InterpolateColors,InterpolatePixels ;
ColorMapArray[0][0] = -10.0;
ColorMapArray[0][1] = -10.0;
ColorMapArray[1][0] = -5.0;
ColorMapArray[1][1] = -5.0;
ColorMapArray[2][0] = 0.0;
ColorMapArray[2][1] = 0.0;
ColorMapArray[3][0] = 5.0;
ColorMapArray[3][1] = 5.0;
ColorMapArray[4][0] = 10.0;
ColorMapArray[4][1] = 10.0;
// Plot this array on the color scale graph control
NumberOfXpoints = 2;
NumberOfYpoints = 5;
NumberOfColors = 5;
InterpolateColors = 0;
InterpolatePixels = 0;
if (PlotIntensity (OGLPanelHandle, OGLPANEL_COLORMAP, ColorMapArray,
NumberOfXpoints, NumberOfYpoints, VAL_DOUBLE, MapColor, VAL_YELLOW,
NumberOfColors, InterpolateColors, InterpolatePixels) <= 0)
return -1;
return 0;
}//CreateColorScale
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